Explainer: As wildfire smoke spreads, who’s at risk?

Smoke from wildfires in the western U.S. and Canada is blanketing much of the continent and reaching unhealthy levels this week in communities from Washington state to Washington D

Explainer: As wildfire smoke spreads, who’s at risk?
Smoke from wildfires in the western U.S. and Canada is blanketing much of the continent and reaching unhealthy levels this week in communities from Washington state to Washington D